package com.atguigu._2facade.my2_;

public class _Light {

    public void TurnOff() {
        System.out.println("Turning on the light.");
    }

    public void TurnOn() {
        System.out.println("Turning off the light.");
    }

    public void ChangeBulb() {
        System.out.println("changing the light-bulb.");
    }
}